Interesting thought about inhalation of Ether for General Anesthesia as a risk factor or triggering agent for PD. While environmental exposure to some "toxin" is an attractive theory but I doubt that Ether inhalation could have been a problem. 1. Anesthetic Ether is a simple two carbon compound which is di-ethyl ether and is an extremely stable substance and unlikely to be a triggering agent. 2. Since the mid 50's, the use of Ether in the USA has almost completely disappeared, while the incidence of PD has not fallen to reflect a decrease in exposure to a triggering agent. If anything, as the use of Ether has declined, the incidence of PD has gone up and done so in an age group that has an increasing amount of exposure to Anesthetics than younger individuals. Ken Janis, MD Anesthesiologist ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn